Magnification for varminting

I have a bushnell elite 4200 2.5-10 that I intend to put on when I get my vxiii 4.5-14 from the custom shop for the .270, I think that the 2.5-10 should be enough for me and the clicks seem to be repeatable and accurate, at least at 100

I bought a Stoney point Target turret off ebay and fitted it, it seems to return to zero reliably (Aiming at a bit of chipped paint on my back fence off a stable rest and winding it up and down), I've got a drop chart worked out for out to 500, I'll see how it goes....